function whichElement(e)
{
	var targ;
	if (!e)
	{
		var e=window.event;
	}
	if (e.target)
	{
		targ=e.target;
	}
	else if (e.srcElement)
	{
		targ=e.srcElement;
	}
	if (targ.nodeType==3) // defeat Safari bug
	{
		targ = targ.parentNode;
	}

	var num=parseInt(targ.id.slice(3))
	var i;
	for (i=1;i<7;i++)
	{
		document.getElementById('desc'+i).style.display="none";
	}
		
	document.getElementById('desc'+num).style.display="block";
}
	
